Steam-boiler.



PATENTED JULY 5, 1904. A. B. DUFF. STEAM BOILER.

AYPLIOATION FILED JAN. 22, 1904.

2 SHEETS-SHEET 2.

N0 MODEL.

NVEAIT020K% 4% 5.601% 13 HM? HYTOIYIVEYJI PATENTED JULY 5, 1904.

A. B. DUFF.

STEAM BOILER.

APPLIOATI01T FILED JAN. 22, 1904.

2 sums-sum: 1.

N0 MODEL.

INVENTOR ma fiTfOfi/V/J UNITED STATES Patented July 5, 1904.

PATENT OFFICE,

STEAM-BOILER.

SPECIFICATION forming part of Letters Patent NO. 764,438, dated J uly'5, 1.904.

Application iiled January 22, 1904. Serial No. 190,188- (No modelf! To all whom, iii-may concern:-

Be it known that I, ALFRED BARKER DUFF, a subject of the King of Great Britain and Ireland, and a resident of Pittsburg, A llcgheny county, State of Pennsylvania, (whose postal address is 5310 Dahlia street, Pittsburg, Allegheny county, State of Pennsylvania,) have invented certain new and useful Improvements in Steam-Boilers, (for which application for British patent has been made January 1, 1904, No. 2,) of which the following is a specification.

My said invention relates to steam-boilers in which steam is raised by means of the heat of gas-producer gases; and it has for its object to improve the heating-surface parts of the boiler, so as to prevent any clogging or choking of these parts, while the arrangements for cleaning, examination, and repair of the boiler parts are also much improved, thereby increasing the efliciency and serviceability of the boiler as a whole. Steamboilers of this class as usually constructed have hitherto proved unsuccessful owing chiefly to defects connected with the design of the heating-surface parts, the heating-tubes employed in such boilers, owing to their smallness and the manner of their arrangement, soon becoming clogged and choked with soot and dust, which afterward cannot be cleaned out satisfactorily owing to the inaccessibility of the said tubes. My improvements are designed to overcome such defects, and they are shown on the accompanying two sheets of drawings, to be hereinafter referred to in describing the said improvements.

Figure 1 on Sheet 1 of the draw ngs is a sectional side elevation; and Fig. 2, Sheet 2, a sectional plan of the improved steam-boiler shown as applied to a gas-producer.

In the drawings the same reference-letters are used to mark similar parts.

According to my invention the improved steam-boiler consists of a vertical outer shell or casing'A of circular form fitted internally with upper and lower horizontal tube-plates B B between which are fixed two pairs or sets of vertical heating-tubes C 0, each tube being large enough to admit a workman for cleaning or repairs. The upper ends of the tubes C 0 open into an upper space or box 1), formed above the upper tube-plate B, such box being arranged with four manholedoors D on the top for the purpose of gaining access to the tubes (1 C. of each pair of tubes C C open, respectively, into separate inlet and outlet bottomspaces or boxes E E arranged below the bottom tubeplate B and preferably formed by dividing a single box part into two by means of a crosspartition plate E, which is lined with lirebrick on its inner side. The outlet-space E is fitted with a discharge-pipe E and the inlet-space E is connected to a brick-lined chamber G, connected to the gas-discharge outlet H of the producer J, the said chamber (3r being provided with a stop-valve G, operated by means of a hand-wheel Gr and spindle G". Cleaning-doors K are provided on the bottom dust-box parts E E a door-fitting being arranged oppositeeach tube, while a similar door Gis also preferably fitted to the bottom of the inlet valved chamber (in A manholedoor A is fitted to the outer shell A of the water-chamber part of the boiler to enable admittance to be gained for cleaning or re pairs, suflicient room being left between the parts inside the boiler, so as to enable any cleaning, examination, or repairs to be accomplished without difliculty.

The boiler A is furnished with the usual valve-pipes and other mountings, and when in' use the hot gas coming from the producer J through the inlet-valve G enters and passes up through the first pair or up-comer set C," of the heating-tubes to the upper box D and then passes down the second pair or down-comer set C of the tubes and through the outlet bottom space or box IE to the discharge-pipe E".

With this improved construction of boiler no clogging or choking of the heating-surface parts can take place, as owing to the vertical arrangement of the heating-tubes (Q G soot and dust will not tend to lodge on the tubes, but will fall into the bottom dust-boxes E, from whence it can be easily removed through the cleaning-doors K, arranged thereon, without seriously interfering with the continuous operation of the gas-producer J. Owing also The lower ends can pass through them for long periods before cleaning or scraping of? their surfaces becomes necessary, and when such cleaning is required they are, as has been shown, easily accessible for the purpose. By my improvements,therefore, an exceedingly eflicient and workable type of steam-boiler-is thus produced, which surfaces connected to a gas-producer, a verticalshell; upper and lowertube-plates arranged horizontally therein, an upper box part above the upper tube-plate, manholedoors on the said box, a set of up-comer and of down-comer heating-tubes fitted vertically betweentlie tube-plates, separate inner and outer dust-box parts fitted respectively to the lower ends of each respective set of heatingtubes, cleaning-doors on the said dust-boxes, a gas-inlet on the inner dust-box connected to the gas-producer, and a gas-outleton the outer dust-box, substantially as and for the purposes herein set forth.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

ALFRED BARKER" DUFF.

Witnesses: v

ROBERT LAWSON ROWLAND, ANTHONY K'ILeoRE BARKER.- 

